am i going to have to do a clean install

hi I need a little help. I'm getting a database query error after members sign up on my join.php.

After everything is put in and all information has been submitted I/they get a red box that says database query error but thats all it says It won't tell me where the error is. I went to cpanel to look for any errors on the site and the page has no errors given at all.

Is there a way to have more information on a database query error?